* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: linear-gradient(to bottom, pink, skyblue);
}

.container {
    width: 1000px;
    position: relative;
}

.container .bigbox {
    width: 1000px;
    height: 500px;
    margin: 10px;
    background: url(images/1.jpg) no-repeat center / cover;
    border-radius: 5px;
    box-shadow: 2px 2px 2px 2px rgba(0, 0, 0, 0.1);
    transition: all 1s;
}

.container ul {
    list-style: none;
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: space-around;
    align-items: center;
    gap: 15px;
}

.container ul li {
    flex: 1;
    height: 120px;
    cursor: pointer;
}

.container ul li img {
    width: 100%;
    height: 100%;
    border-radius: 10px;
    box-shadow: 2px 2px 2px 2px rgba(0, 0, 0, 0.1);
}

.container ul li img.active {
    border: 5px solid orange
}